(S)-Cheilanthifoline is a benzylisoquinoline alkaloid (BIA) which has been isolated from Corydalis dubia[1] and Argemone mexicana.

[citation needed] (S)-Cheilanthifoline is metabolically derived from (S)-reticuline, a pivotal intermediate in the biosynthesis of numerous BIAs.

(S)-Cheilanthifoline is the immediate precursor of the BIA (S)-stylopine ((S)-stylopine synthase/CYP719A20), which is the precursor for the alkaloids protopine and sanguinarine.

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